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BAd Signals on several plane types

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  • BAd Signals on several plane types

    Hy,

    today a have a significant amount of planes marked with "bad Signal" I checked my receiver and antenna, but they are o.k..

    I found out that some plane types do not deliver the long and lat even the course and speed. The signal comes about every 2-7 seconds.

    These are : SW4, CRJ7, CRJ1, DH8D...

    Are there technical matters or may this have other reasons.

    Ralph

  • #2
    What software was showing the planes as "bad signal"? You mention you checked your receiver and antenna. What ModeS receiver are you using?

    The aircraft types you mention will have ModeS transponders but not ADS-B. Therefore they will usually appear in the software list of ModeS transmitting aircraft but cannot plot on a map simply because they don't transmit positional data (ADS-B). Sometimes these aircraft can have their position calculated by Multilateration, as used by SBS-2 and PlanePlotter.

    This document is quite helpful:

    http://rfdesign.com/mag/512RFDSF3.pdf
    Mike


    www.radarspotting.com

    Radarspotting since 2005

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